Q. Ultrasound Bolt Load Monitoring?
Ultrasound measurement of bolt stresses, using ‘Bolt Scope', should be used on:
• All bolts tightened by tensioning.
• All bolts in hydrogen service.
• All bolts in hydrocarbon service with pressure rating Class 900 and above.
• Bolt sizes ¾ in (20 mm) and larger in critical service.
A minimum of 20% of the bolts shall be tested.
To ensure required accuracy and field efficiency, proper preparation of stud ends must be provided. Stud ends must be machined flat and parallel.